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. 2005 Sep 13;93(7):817–824. doi: 10.1038/sj.bjc.6602758

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Copyright © 2005 Cancer Research UK

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Relative risk of premenopausal breast cancer in relation to participation in sports at different ages. Black squares indicate relative risks (RRs), area of which is proportional to the amount of information contributed (i.e., to the inverse of the variance of the logarithm of the RRs). Lines indicate 95% floated confidence intervals (FCIs; see Material and Methods).